<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>对话框</title>
    <link rel="shortcut icon" href="../lib/image/favicon.ico" type="image/x-icon">
    <link rel="stylesheet" href="../lib/css/all.css">

</head>
<style>
    .content-box {
        height: 100px;
        width: 200px;
        border-radius: 10px;
        position: relative;
        background: #fff;
        /* margin: 10px; */
    }

    .content-box::after {
        content: '';
        position: absolute;
        top: 100%;
        right: 16px;
        width: 4px;
        height: 16px;
        border-width: 0;
        border-right: 12px solid #fff;
        border-radius: 0 0 20px 0;
    }
</style>

<body>
    <div id="app" style="background-color: aqua;padding: 20px;">
        <div class="content-box"></div>
    </div>
</body>

</html>